Fused plug and receptacle.



No. 857,735. PATENTED JUNE 25, 1907. J. O. HATZEL & E. L. MORLEY.

FUSED PLUG AND RBUBPTAOLE.

APPLICATION FILED JAN.5, 1906.

6 I J 3/ pd" I UNITED sTATEs PATENT oEEIoE.

JoHN'o' HATZEL AND EDGAR L. MORLEY, OF NEW YORK, N. Y.

' F-us so PLUG AND RECEPTACLE.

Specification of Letters Patent.

Patented June 26, 1907.

Application m January 5,1906. Boris-1N0. 294,704.

To all whom it mayconcern:

Be it known that we, JOHN C. HATZEL and EDGAR'L. MORLEY, citizens of the United States, and residing in the city of New York, county and State of New York, have invented a new and useful Improvement in Fused Plugs and Receptacles, of which the followin is a description.

The object of these plugs and receptacles is for use in transferring currents of various kinds from a switch-board to other receptacles with which the circuits are connected, the construction of the plug itself bein such that the standard fuse may be inclosed therein and all metallic current bearing parts are so covered as to avoid all possibihty of accident. The rece tacles are mounted on marbleized slate oard or any other type of so called switch or distributing boards. A pair of plugs connected by flexible leads can be inserted in the receptacles and the current transferred from one set of leads or circuits to another as for example, leads or circuits of different kinds such as alternating and direct currents of difierent voltages can be brought to the receptacle on the switchboard and then transferred to other receptacles to which the circuits are connected.

And again, for storage battery use where the leads for the cells may be brought to the receptacles and then by means of the lu s transferred to other circuits. These fea s in connection with the link connectors may be utilized to transfer storage battery currents of any desired amount or voltage within the limits or capacity of the battery.

The apparatus as a whole is particularly adapted for laboratory use, educational use and experimental work, but of course it can be utilized for any other purposes requiring the transfer of currents from one circuit to another. In carrying out our invention, we make use of the structures illustrated in the accompanying drawings, in which: i Figure 1 illustrates a pair of plu s connect ed by a flexible lead or cable. *ig. 2 illustrates a receptacle designed to receive either plug. Fig. 3 illustrates a plan view of the rece tacle. Fig. 4 illustrates a plug of smaller capacity, and Fig. 5 a receptacle for the same.

The structure illustrated in Fig. 1 is designed for heavy currents up to and over 100 amperes and consists of the pair of plu s A and B connected together by means 0 the flexible lead 0. The plug A is composed of 'the parts A and A made of insulating material and connected together b the screw i'oint A, and when so connecte present the ongitudinal cylindrical cavity D as shown. The lead C is led into the upper end of the plug and the cable wires thereof are inserted into the metallic thimble E to which they are secured in any suitable manner as by soldering or what is known in the art as sweating. The thimble E is held in position b means of the screws F. Pro'ecting from t e lower end of the plu E are t e two knife blades G as shown. T e vents V are provided in the upper section A for the purpose of carryin off the products of an ex ploded fuse. en constructed as shown and described, the standard inclosed fuse H (shown in dotted lines) may be fixed'in osition with its upper knife edge I located etween the two blades G and the lower knife edge K projecting from the lower end of the lug-A. The plug B is constructed of insulitting material and has the flexible lead C inserted therein and secured to the thimble E which latter is held in place by means of the screws F as shown. Projecting from the lower end of the thimble E is the knife edge L.

The receptacle illustrated in Fig, 2 is mounted upon the slate switch-board M as shown, the metallic tube N being inserted through an aperture in said slate and held in position by means ofthe thimble O secured in one end by means of the pins n, and the nut and washer P screwed upon the screwthreaded portion of said tube N. Centrally through the thimble O is a rectangular aper ture Q through which the 'L-shaped contact springs R are inserted, said springs being held upon the upper face of the thimble O in any convenient manner as by soldering. The

cap S is constructed of insulating material 1 and formed so as to fit over the upperflanged portion of the thimble O, to which it is secured bymeans of the screws 8., The recess T is formed in the upper portion of said cap and in the bottom of said recess is the rectangular aperture u, such recess and a erture being designed to receive the lower en of the plug A and the knife edge K of the standard inclosed fuse H, which when in position will be in contact with the springs R of the receptacle. The thimble W is screwed on to the lower end of the tube N as shown and is for the purpose of connecting the leading-in or circuit Wires. The cup shaped cap S serves not only as a support for the heavy plug when inserted, but protects all live parts on the front of the board. 7 When the lug A is inserted in the rece tacle, it will be noted that complete meta lic connection is made from the thimble W to the knife edge L through the inclosed and protecting fuse H. In practice, the plugs are used in double pairs, that is, one set of plugs A and B are used as leading-in conductors and another like set for the return current, it being under- .stloodBthat a similar receptacle is used for the u p T he plug and rece tacle illustrated in Figs. 4 and 5 are designe for smaller currents up to, say, 25 am eres. The plug is formed of the parts a an a of insulating material connected together by the screw joint a The small internally threaded tube e-is cast into the upper section a into which is fitted the thimble c, said thimble being provided with means for attaching a flexible lead similar to that illustrated in Fig. 1. The lower section it carries, the contact piece (1 held in position by means of the nut d secured upon the upper end of the contact piece (1. A portion of the contact piece (1 is covered with insulation f as shown. The interior cavity 9 is provided within the section for the reception of a barrel shaped fuse, inasmuch as the standard inclosed fuse up to 60 ampere capacity is not provided with the knife edges I and K as shown in Fig. 1. In order to insure metallic contact between the upper end of the plug it and thimble e, I provide the small contact spring e upon the lower end of the thimble c. When in position, the fuse it will be confined between the spring 6 and the nut d or the upper end of the contact piece at thereby insuring metallic circuit through the length of the fused plug. The receptacle for the smaller plug differs but slightly in principle from that illustrated in Fig. 2. The tube n passes through the slate switch-board m being secured in position by means of the nut 0 on the one end and the nut and washer p on the other. In the lower end of the tube we secure the thimble g in any convenient manner as by soldering or screwing the same into the tube n. Within the tube and secured to the thimble g by means of the small screw 1' is the contact spring 8 as shown. The binding screw 1 is designed to secure the main circuit wire in electrical contact with the metallic parts of the receptacle. It will now be noted that upon the insertion of the plug into the receptacle, the contact piece (1 will enter be-.

tween the leaves of the spring 8 and thereby a complete metallic circuit is formed between the circuit wire through the standard inclosed fuse h to the flexible lead connected with the thimble e. In practice these plugs and receptacles are used in double pairs in substantially the same manner as described in connection with the plugs and receptacles illustrated in Fi s. 1 and 2. The plug connected to that il ustrated in Fig. 4, however, need not be provided with a fuse if not de sired. In such case, the metallic contact iece d may extend up to, and be screwed into the thimble e.

We claim:

1. A switch-board receptacle comprising a tubular casing, means for securing said casing upon a switch-board, a contact spring within and electrically connected to said casing and means 'for securing a circuit wire in electrical connection with said casing.

2. A switch-board receptacle comprising a metallic tubular casing, a pair of contact springs extending longitudinally within said casing, a thimble secured to one end of said casing,- said thimble being provided with means for securing a circuit wire thereto.

3. A plug for switch boards, comprising a handle composed of insulating material, said handle having a longitudinal aperture therethrough, a portion of said aperture being enlarged to form a fuse cavity, means for permanently securing a flexible lead or cable in one end of said handle, and a standard inclosed fuse in said cavity in metallic connec tion with said lead orcable.

4:. A plug for switch boards, comprising a sectiona handle comprised of insulating material, said handle having a lon itudinal aperture therethrough, a portion 0' said aperture being enlarged to form a fuse cavity, a spring secured in one end of said cavity, means for permanently securing a flexible lead or cable in one end of'said aperture in metallic connection with said spring.

5. A plug for switch boards, comprising a handle composed of insulating material, said plug having a longitudinal aperture therethrough, said aperture being enlarged at one portion thereof to form afuse cavity, means for permanently securing a flexible lead or cable in one end of said plug, a standard inclosed fuse in said cavity in metallic connection with said lead or cable, and an external metallic circuit closing connection in metallic contact with said fuse.

6. In an electrical device of the character described, the combination of a pair of plugs each having external metallic circuit closing connections, a flexible lead or cable in metallic circuit with said circuit closing connections, one of said plugs having a standard inclosed fuse inserted in said metallic circuit and inclosed within said plug.

This specification signed and witnessed this 2d day of J anua 1906.

JO N C. HATZEL. EDGAR L. MORLEY. Witnesses:

JOSEPH BUEHLER, LOUIS M. SANDERS. 

